Calculate the average atomic mass of carbon if 98.90% of the atoms are c-12 (12. amu) and 1.100% are c-13 atoms (13.003354 amu). give your answer to the correct number of significant figures.

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Amixture with the same composition throughout is!